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AS1902C26

Ultra Low-Power µP Supervisory Circuit

austriamicrosystems AG 

AS1901, AS1902, AS1903

Ultra Low-Power µP Supervisory Circuit

Data Sheet

1 General Description

2 Key Features

The AS1901/2/3 family is an ultra low-power supervisory

circuit device.

The device can be used to monitor the supply voltage of

lid digital systems and microprocessors and initiate a reset

when the voltage goes below a predefined threshold.

The duration of the reset is 5/20/100/500ms (typ.) after

the supply voltage has risen above the threshold.

a The AS1901/2/3 exhibit excellent reliability and can

reduce application costs by eliminating all external com-

v ponents.

ill The device is available with different output drivers:

! The AS1901 has a push-pull driver with an active low

reset.

t ! The AS1902 uses the same output stage as the

AS1901, but has an active high reset.

G s ! The AS1903 has an open drain output with active low

reset.

A t All devices operate down to a voltage of 1V.

s 3 Applican The reset thresholds are factory-trimmable between

tions 2.2V and 3.08V in steps of approximately 100mV.

e Each device of the AS1901/2/3 family is offered with four

m t time-out periods of 5/20/100/500ms.

The extremely low current consumption of only 230nA

a n (typ) at 3.3V makes the device ideal for use in portable

applications.

o All devices are available in a 3-pin SOT23 package.

! Low 230nA (typ) Supply Current

! Precision Monitoring of 2.5-, 3-, and 3.3V-Power

Supplies

! Supply Voltage Range: 1.0 to 3.6V

! Reset Threshold Range: 2.2 to 3.1V

! Available in 3 Versions:

- AS1901 Push Pull RESETN

- AS1902 Push Pull RESET

- AS1903 Open Drain RESETN

! 4 Time-Out Periods Ranging from 5 to 500ms

! Detection Voltage Accuracy: ±1.5%

! Temperature Range: -40 to +85°C

! Package: SOT23-3

The devices are ideal for computers, intelligent instru-

ments, controllers, critical microprocessor and micro-

controller, power monitoring and portable/battery-

powered equipment.

al c Figure 1. Functional Block Diagrams

ic VCC

3

VDD

VCC

hn AS1901

cAS1902

e RESETN, 2

T RESET

Microprocessor

RESET

VCC

3

VDD

AS1903

2

RESETN

VCC

Microprocessor

RESET I/O

GND

GND

GND

GND

1

1

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